src/Tools/jEdit/src/jedit_resources.scala

   def node_name(path: String): Document.Node.Name =
     JEdit_Lib.check_file(path).flatMap(find_theory) getOrElse {
       val vfs = VFSManager.getVFSForPath(path)
       val node = if (vfs.isInstanceOf[FileVFS]) MiscUtilities.resolveSymlinks(path) else path
       val theory = theory_name(Sessions.DRAFT, Thy_Header.theory_name(node))
-      if (session_base.loaded_theory(theory)) loaded_theory_node(theory)
+      if (session_base.loaded_theory(theory)) Document.Node.Name.loaded_theory(theory)
       else {
         val master_dir = vfs.getParentOfPath(path)
         Document.Node.Name(node, master_dir = master_dir, theory = theory)
       }
     }